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[SOLVED] Photodiodes w/ JFET VCR feedback

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RitchRock

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Hi all, I'm working on an optical sensor and am looking to increase my SNR. I've constructed a circuit to cancel out LED emitter noise with feedback control. PDref monitors just the emitter, while PDsig carries the sensor signal + emitter noise. Feedback consists of integrator -> JFET VCR -> current divider. Please see attached circuit. LT Spice simulation works well, but in real-world implementation I don't see the JFET resistance changing (I believe it should balance when I move VR1). Any suggestions on what I could be missing from moving from the simulation to prototype?

PDs with JFET VCR.jpg
 
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